Solana: Custom error 0x7d6

Understanding a Custom Code Error in Solana

As an aspiring developer working with Anchor, a popular Rust framework for building blockchain applications on Solana, you may have encountered an error that seems inexplicable. The error message you are seeing is known as a “custom code error” (0x7d6), and it indicates that there is a problem with the processing of your events on the Solana network.

What is a custom code error?

A custom code error in Anchor occurs when the Anchor runtime encounters a piece of code in your Rust program that does not conform to the rules set by the Solana programming language. This may seem like a minor glitch, but it can actually prevent your application from functioning properly.

“Event sending failed” error

In your case, you are encountering the “Event simulation failed: Error processing instruction 0” error. This indicates that there was a problem with your program’s instructions (i.e., the code executed during the event simulation process). The specific instruction that caused this error is listed as instruction 0.

Error processing custom program message

When you run a Rust program, Anchor attempts to run it in a sandbox environment. This sandbox is necessary because Solana applications must adhere to strict code compliance rules. If your code does not meet these requirements, Anchor will issue an error message indicating that there is a problem with your custom program.

Troubleshooting steps

To resolve this issue, follow these steps:

• Check your code: Check your Rust program for suspicious or inconsistent code segments. Make sure that all instructions are properly defined and comply with the Solana programming language rules.

• Check for typos: Check your code for typos in variable names, function definitions, and other areas where Anchor may report potential issues.

• Check for dependencies

  : Make sure you are using all required dependencies and libraries in your project to ensure they comply with Solana standards.

What can you do if the problem persists?

If you still encounter the same error after checking and updating your code, try:

• Use a different version of Anchor or Rust: Sometimes issues are related to specific versions or configurations. Try switching to an older or newer version to see if that resolves the issue.

• Used with --debug flag: This flag allows Anchor to print more detailed information about the compilation process, which may help identify the root cause of the issue.

Conclusion

Understanding and troubleshooting custom program errors in Solana requires attention to detail and thorough code review. By following these steps, and adhering to the strict rules imposed by the Solana programming language, you should be able to resolve this issue and continue developing your project on the platform.

Examples of Use Cases

To illustrate troubleshooting and resolving custom program errors in Rust, consider the following example:

“` Rust

use width_only::prelude::*;

// Define a simple function that simulates an event.

pub fn my_function() -> Result<(), Error> {

// Simulate an error: this will trigger an “Error processing custom program” message

Error(Error::custom(0x7d6))

}

#[schedule]

pub mod sole_program {

use anchor_lang::{account_info, entrypoint, storage};

use std::collections::HashMap;

#[call]

pub fn my_function() -> Result {

let state = account_info::load_storage(&key_prefix!())?;

// Perform some action…

Ok (())

}

#[entrypoint]

fn main() -> Result<(), Error> {

// … (other entry points)

if Let Err(err) = my_function() {

// Handle error

println!

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